linux-kernel - Re: [PATCH v5 11/16] cxl/pci: Add log message for umnapped registers in existing RAS handlers

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Message-ID: <20250114114151.0000491d@huawei.com>
Date: Tue, 14 Jan 2025 11:41:51 +0000
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Terry Bowman <terry.bowman@....com>
CC: <linux-cxl@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-pci@...r.kernel.org>, <nifan.cxl@...il.com>, <dave@...olabs.net>,
	<dave.jiang@...el.com>, <alison.schofield@...el.com>,
	<vishal.l.verma@...el.com>, <dan.j.williams@...el.com>,
	<bhelgaas@...gle.com>, <mahesh@...ux.ibm.com>, <ira.weiny@...el.com>,
	<oohall@...il.com>, <Benjamin.Cheatham@....com>, <rrichter@....com>,
	<nathan.fontenot@....com>, <Smita.KoralahalliChannabasappa@....com>,
	<lukas@...ner.de>, <ming.li@...omail.com>,
	<PradeepVineshReddy.Kodamati@....com>, <alucerop@....com>
Subject: Re: [PATCH v5 11/16] cxl/pci: Add log message for umnapped
 registers in existing RAS handlers

On Tue, 7 Jan 2025 08:38:47 -0600
Terry Bowman <terry.bowman@....com> wrote:

> The CXL RAS handlers do not currently log if the RAS registers are
> unmapped. This is needed inorder to help debug CXL error handling. Update
> the CXL driver to log a warning message if the RAS register block is
> unmapped.
> 
> Signed-off-by: Terry Bowman <terry.bowman@....com>

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

> ---
>  drivers/cxl/core/pci.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c
> index 5699ee5b29df..8275b3dc3589 100644
> --- a/drivers/cxl/core/pci.c
> +++ b/drivers/cxl/core/pci.c
> @@ -656,8 +656,10 @@ static void __cxl_handle_cor_ras(struct device *dev,
>  	void __iomem *addr;
>  	u32 status;
>  
> -	if (!ras_base)
> +	if (!ras_base) {
> +		dev_warn_once(dev, "CXL RAS register block is not mapped");
>  		return;
> +	}
>  
>  	addr = ras_base + CXL_RAS_CORRECTABLE_STATUS_OFFSET;
>  	status = readl(addr);
> @@ -700,8 +702,10 @@ static bool __cxl_handle_ras(struct device *dev, void __iomem *ras_base)
>  	u32 status;
>  	u32 fe;
>  
> -	if (!ras_base)
> +	if (!ras_base) {
> +		dev_warn_once(dev, "CXL RAS register block is not mapped");
>  		return false;
> +	}
>  
>  	addr = ras_base + CXL_RAS_UNCORRECTABLE_STATUS_OFFSET;
>  	status = readl(addr);